o neill



Get. 27, 1925.

T. A. O NEILL AUTOMATIC GAS CUT-OFF Filed Feb. 25, 1924 2 Sheets-Sheet 1 54mm. 011M;

INVENTOR ATTORNI WITNESS:

Oct. 27, 1925- T. A. O NEILL AUTOMAT I C GAS CUT- OFF Filed Feb. 25, 1924 2 Sheets-Sheet 2 220mm. 021M! ATTORNEY WITNESS:

PatentedQCt.27,19 25. i

UNITED STATES THOMAS A. ONEILI, OF NEW YORK, N. Y.

au'rouArrc ens cur-on.

Application flledl'ebruary 25, 1924. Serial No. 695,064.

To all whom it may concern:

Be it known that I, THOMAS A. ONEILL', a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented new and useful Improvements in Automatic Gas Cut-Offs, of which the following is a specification. l 1

This invention relates to automatic gas cut-ofis for use in connection with steam or hot water boilers. Y

The principal object of the invention is the provision of an automatic gas cut-oil wherein the valve for controlling the flow of gas to the burner is held opened by a mechanism operable by reason of the water level in the boiler, whereby the water upon reaching its low level will automatically close the valve to shut-'ofi" the flow of gas to the burner, thus assuring an absolutely safe aption and combination and arrangement of parts, the essential features of which are hereinafter fully described, are partlcularly pointed out in the appended claims, and are illustrated in the accompanying draw1ng,.1n""

which Figure 1 is a side elevation of my invention shown applied to a boiler.

Figure 2.is an enlarged detail sectional view of a portion of the'same and showing the valve in open position.

Figure 3 is a view similar to Figure 2 but showingthe .valve in closed position.

Figure 4 is a detail vertical sectional view showing a slight modification. 4

Figure 5 is a view similar to Figure 4 but showing a still further modification.

Referring more particularly to the drawing, the reference numeral designates the steam boiler of the usual well-known construction and beneath which is mounted a gas burner 11. The boiler is normally filled with water to a point adjacent the top thereof and which water is adapted to be heated to a steaming point by the burner 11, and the steam utilized for heating or like purposes.

In the present style of boilers, it often happens that the burner continues to heat the boiler after the water has reached its low level and which is the cause for much dissatisfaction. It is therefore. the purpose I of my invention to overcome this objection by providing a meanswhich is automatically operable for shutting-off the flow of gas to'the burner when the water has reached its low level;

.The numeral 12 designates a gas supply valve head in closed position over the passage way 18. A lockingpin is mounted for sliding movement in the casing=14 at right angle to the longitudinal axis of the plunger rod 15. .The pin 20 is formed with a head 21 for the abutment of one end of a spring 22, :theother end of the-spring restingjagai'nst' the valve casing 14. The free. en'd'of the pin is adapted to co-act with a depression or recess'23 in the valve head as shown in Figure 2 of the drawing.

, Supported by the boiler 10 and at one side thereof isa tank 24 which is arranged adjacent the bottom of the boiler. Pipes 25 and 26 connect the-f'tank '24 with the boiler 10 and serve to support the same in spaced relation thereto. It will be seen that as the boiler is-filled with water, the same will flow seek its own level. Secured to the bottom of the tank 24 is a rod '27 which rests on the head 21 of the pin 20 for a purpose to be described.

In operation, the lunger 13 is moved inwardly to uncover t e passage way 18 and to bring the recess 23 into register with the in 20. The weight of the water in t e tank 24- causes -a slight downward movement of the tank which in turn causes the in to be seated in the recess 23.

The flow 0 gas from the suppl ipe 12 is free to pass to the burner 11 an t e burner' "into the tank through the pipes and therein;

. recess 23, permitting the spring 19 to movethe valve head 17 over the passage-way 18- lid ill)

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Lea-ll tank and boiler decreases until the... level reaches the position shown in Figure 3 of the drawing at which time the spring 22 overcomes the weight of the tank and re leases the pin from engagement with the thereby shutting oil the flow of gas to the burner and preventing overheating of the boiler. in the form shown in Figures 1 to 3 inclusive, the tank is connected to theboiler by straight pipes which will permit a slight movement of the tank necessary to bring the pin into coaction with the recess 23. This movement is only a fraction oi an inch and if desired,.pipes and 31 as shown in Figure 4c of the drawing might be connected to. the tank and boiler by means of flexible connections 32 in the. form of a ball and socket joint. Thiswill permit free movement of the tank with respect to the bolier without placing a strain upon the connecting pipes- In Figure 5 there is shown a further modified form of connection between the tank and the boiler wherein use is made of coils of pipe 33 and 34. This will permit ample movement of the tank with respect to the boiler as will be clearly understood.

While I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way departing from the spirit of invention, and I thereforedo not limit myself to the eitact details of construction herein set forth nor to anything less than the whole of my invention limited only by the appended claims.

Wat is claimed as new is:

1; In a device of the class described. the combination with a boiler, a burner for heating said boiler, a valve, manually operable means for opening said valve to permit fuel to flow to said burner. means for holding said valve in open position when the level .oi water inthe boiler is above a predetermined height including a lnovable tank in open communication with said boiler, and means operable for closing said valve when the level of water reaches a low level.

2. In a device of the class described, the combination with a water boiler, a burner for heating the water in said boiler, a valve for controlling the flow of fuel to said burner, manipulating means for opening said valve, a tank, means for supporting said tank from said boiler for vertical movement with respect thereto and for permitting communication between the boiler and tank. and means operable by the weight of said tank and its contents for holding said valve in open position. v

3. In a device of the class described, the combination with a water boiler, a burner agen as? valve, a tank, means for supporting said tank from said boiler for vertical movement with respect thereto and for permitting communicat'ion between. the boiler and' tank,

and meansoperable by the weight of said tank and its contents for holding saidvalve in open position, and means automatically operable when the contents oi said tank is reduced to a low level to cause the valve to move to shut-0E position.

4. In combination with a water boiler, a burner for heating the water in said boiler, a valve for controlling the iiow of gas to said burner com rising a sliding valve, means for norma ly holding said valve in closed position, manipulating means for moving said valve to open position, a recess formed in said valve, a pin for co-action with said recess'when the valve is in open position, means for holding said pin seated in said recess when the water in said boiler is above a predetermined level, and means-for returning said valve to normal position upon the releasing of said pin.

5. In combination with a water b0iler, a burner for heating the water in said boiler, a

Bil

valve -i'or controlling the flow of gas to said 6. In combination with a water boiler, a

burner for'heating the water in said boiler. a

valve for controlling the How of gas to said burner comprising a sliding valve. means for normally holding said valve in closed posi sition, manipulating means for moving said valve to open position, a recess formed in said valve, a pin for co-action with said recess when the valve is in open position, means for holding said pin'seated in said recess when the water in said boiler is above a predetermined level. means for automatically lifting said pin from said recess when the level of water reaches a low level, and means for simultaneously moving said valve to closed position upon the operation of said last mentioned means.

.7. In combination with a water boiler, a burner for heating the water in said boiler, a valve for controlling the'fiow of gas to said burner comprising a sliding valve,

means for normally holding said valve in closed position, manipulating means for moving said valve to open position, a recess formed in said Valve, a pin for co-action with said recess when the valve is in 0 11 position, atank mounted above said va ve, flexible pipes connecting said tank with said boiler for permitting the water in said boiler to seek its level in said-tank and for permitting a slight vertical movement of said tank with respect to said boiler, a rod secured to said tank and co-operative with said pin to move the pin into co-acting engagement with said recess when the water in said tank is above a predetermined level, and means for lifting :s-aid tank when the water therein reaches a low level and for releasing said pin from said recess, and means for automatically moving said valve to closed position upon the operation of said last an mentioned means.

.In'testimony whereof Ihave afiixed my signature.

THOMAS A. ONEILL. 

